Pouch with spout

ABSTRACT

A pouch with a spout includes a pouch body  1  formed by overlapping and thermally fusing both end portions, forming a seam, of a flexible film material and a spout  3  to be inserted between the film end portions of the pouch body  1  and then thermally fused together with the film end portions to the pouch body, wherein a stress dispersion patch  4  is bonded so as to cover partially both a spout seal portion  2  and a deformable film portion  5  so as to straddle a boundary portion between the spout seal portion  2  and the deformable film portion  5  facing an inner space of the pouch body  1.

FIELD OF THE INVENTION

The present invention relates to a pouch with a spout to a pouch body.

BACKGROUND ART

Such a pouch with a spout of a conventional structure was produced by thermally fusing a spout having a high rigidity and a pouch body formed from a flexible film.

FIG. 4 represents a conventional general pouch with a spout. That is, such a pouch with the spout is a bag body formed by laminating a plurality of flexible films, and the pouch is composed of a pouch body 101 formed by thermally fusing and then sealing film end portions of the pouch body forming a seam and a spout 103 which is inserted between the film end portions of the pouch body 101 and then thermally fused and sealed together with the film end portions.

However, there is a difference in rigidity between a deformable film portion 104 facing to an inside accommodation space of the pouch body 101 and the spout 103 as a mold product. Accordingly, when a pressure of a content stored inside the pouch body is increased or the inner pressure of the pouch body 101 is increased by, for example, an impact at a time of falling of the pouch body 101, the film portion is swelled largely and a stress is likely concentrated on a boundary portion 105 between a spout seal portion 102 and the film portion 104. Specifically, the stress is likely concentrated on a portion near an intersection (point) P between lateral edge portions 103 a of the spout 103 and the boundary portion 105 positioned at the inner edge portion of the spout seal portion 102, and the film may be broken at a portion near the above-mentioned portion. In addition, the spout seal portion 102 of the spout 103 is made thin by the heat and pressure at the time of thermally fusing process, and accordingly, the film may be broken in addition to the stress concentration.

As mentioned above, a pouch with a spout is inferior to a pouch with no spout in pressure-proof performance and falling-impact-proof performance, thus being disadvantageous.

In addition, in a conventional pouch with a spout, there may easily cause a case in which when the inner content near the spout 103 is taken out, the film portions forming the surfaces of the pouch body 101 are stuck, resulting in self-closing (or self-blocking) of the pouch body 101 and it becomes difficult to take out the inner content, thus being also inconvenient.

In order to prevent such self-closing, in the prior art, a plate-shaped or bar-shaped self-closing preventing member 106 was inserted. However, in such structure, the number of members is increased as well as manufacturing cost increasing. Moreover, since the self-closing preventing member should be formed integrally with the spout, the formation thereof involves a difficult working.

Furthermore, a conventional technology for preventing the stress concentration on the edge portion of the spout is disclosed, for example, in a Patent Publication 1 (Japanese Unexamined Patent Application Publication No. HEI 7-251881). In this Patent Publication 1, a configuration (shape) of the inner edge portion of the spout to be thermally fused is made to be circular-arc shape recessed toward the edge portion from the central portion thereof so as to disperse the stress to the circular-arc shape portion so as not to concentrate the stress on the edge portion.

However, in the structure disclosed in the above Patent Publication 1, it is necessary to form the spout so as to have a specific shape and it was difficult to apply such spout to an existing pouch with a spout. In addition, a technology for solving a problem of the self-closing has not been proposed.

DISCLOSURE OF THE INVENTION Problem to be Solved by the Invention

The present invention was conceived to solve the above mentioned matters encountered in the prior art and an object thereof is to provide a pouch with a spout capable of dispersing a stress to be concentrated on a boundary portion of a spout seal portion with a simple structure to thereby improve a pressure-proof performance and falling impact-proof performance.

Means for Solving problem

In order to achieve the above object, the present invention provides a pouch with a spout including a pouch body formed by overlapping and thermally fusing both end portions, forming a seam, of a flexible film material and a spout to be inserted between the film end portions and then thermally fused together with the film end portions to the pouch body,

wherein a stress dispersion patch is bonded so as to cover partially both the thermally fused portion of the spout and a deformable film portion in a manner of straddling a boundary portion between the thermally fused portion of the spout and the deformable film portion facing an accommodation space of the pouch body.

It may be desired that the stress dispersion patch is provided so as to cover an intersection of lateral edge portions of the spout and the boundary portion between the thermally fused portion of the spout and the film portion.

It may be preferred that the stress dispersion patch has a three-dimensional structure following a shape of the spout.

It may be desired that an outer peripheral shape of a portion bonded to the deformable film portion side of the stress dispersion patch has a smooth curved shape.

Effect of the Invention

It may be also preferred that an emboss portion or slot is formed on a surface of the stress dispersion patch as slip prevention means.

It may be desired that rigidity adjusting means is provided on the stress dispersion patch. In this example, it may be preferred that rigidity of the portion to be bonded to the deformable film portion side of the stress dispersion patch is made to be gradually smaller toward the outer peripheral edge thereof. As the means for reducing the rigidity, a plurality of slits may be disposed on the outer periphery of the portion to be bonded to the film portion side of the stress dispersion patch, or may be formed such that a portion to be bonded to the film portion side of the stress dispersion patch has a thickness gradually reducing toward an outer peripheral edge portion thereof.

The stress dispersion patch may be formed of the same material as that forming the pouch body.

According to the present invention mentioned above, even if the inner pressure of the pouch body is increased by the thermal expansion of the inner content or the impact at the time of falling of the pouch body, the stress is dispersed by the stress dispersion patch, and the stress is not concentrated on the boundary portion between the thermally fused portion of the spout and the film portion, and particularly, on the intersection of the lateral edge portions of the spout and the boundary, thereby preventing the film from being broken.

In addition, by providing the stress dispersion patch, a proper rigidity is produced, the self-closing of the pouch body near the spout root portion can be prevented from causing.

Furthermore, since the stress dispersion patch has a proper rigidity, this stress dispersion patch may be utilized as a hand grasping portion and the pouch body can be easily handled.

Furthermore, since the- stress dispersion patch is bonded to the outer surface of the pouch body, the inner content is never influenced by the nature of the substance forming the stress dispersion patch.

By changing shapes, colors, decorations, or the like of the stress dispersion patches, they can be differentiated.

Especially, by providing the stress dispersion patch so as to cover the intersection of the lateral edge portions of the spout and the thermally fused portion, the film can be effectively prevented from being broken.

The bonding working can be easily done by forming the stress dispersion patch into three-dimensional structure following the shape of the spout.

Moreover, since the outer peripheral shape of the bonded portion on the film portion side of the stress dispersion patch is formed in the smooth curved shape with no corner portion, the stress is never concentrated to the outer peripheral portion of the stress dispersion patch. In addition, by forming slip preventing means on the surface of the stress dispersion patch, slipping of the pouch body, when it is grasped by a hand, can be prevented and the pouch body can be easily handled.

Furthermore, the flexibility of the stress dispersion patch can be easily controlled by providing the rigidity adjusting means such as by forming slit or hole.

Especially, the flexibility of the film portion can not be damaged and the stress can be preferably dispersed by forming a slit to the outer peripheral edge portion of a portion to be bonded to the film portion side of the stress dispersion patch or making gradually thin the thickness thereof toward the outer peripheral side.

Further, by forming the stress dispersion patch of the same material as that forming the pouch body, it is not necessary to separately dispose of the stress dispersion patch and the pouch body.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 represents a pouch with a spout according to a first embodiment of the present invention, in which FIG. 1A is a front view thereof, FIG. 1B is a side view thereof, FIG. 1C is a schematic cross sectional view in which a spout seal portion is developed, FIG. 1D is a partial front view showing an example in which a through hole is formed to a stress dispersion patch, and FIGS. 1E and 1F are views showing modified examples of the stress dispersion patch.

FIG. 2 includes FIG. 2A being an illustrated plan view showing a stress dispersion patch of the pouch with the spout of FIG. 1 to which a rigidity adjusting hole is formed, FIG. 2B being an illustrated plan view showing the stress dispersion patch having an outer peripheral edge to which a slit is formed, FIG. 2C being an illustrated side view of the stress dispersion patch in which an outer periphery of the extending portion is made thin, and FIGS. 2D and 2E being illustrated front views showing modified examples of the stress dispersion patches.

FIG. 3 represents a pouch with a spout according to a second embodiment of the present invention, in which FIG. 3A is a schematic perspective view thereof, FIG. 3B is a schematic perspective view of the pouch in a folded state, FIG. 3C is an illustrated sectional view showing a spout seal, and FIG. 3D is a front view of the pouch in a state accommodated in an outer container.

FIG. 4 represents a conventional pouch with a spout, in which FIG. 4A is a front view thereof and FIG. 4B is an illustrated sectional view showing a spout seal.

EXPLANATION OF REFERENCE NUMERAL

1—pouch body,

11—flat film (front surface film and back surface film),

12—side film, 13—side seal portion, 14—upper side seal portion, 15—bottom side seal portion,

2—spout seal portion,

3—spout,

31—base portion, 32—spout tube, 33—cap, 34—discharge port, 35—central portion, 36—extending portion (extension), 3 a—edge portion,

4—stress dispersion patch (stress dispersion piece),

41—circular-arc portion, 42—straight portion, 43—lateral (right and left) straight portion, 44—through hole, 45—film side straight portion, 46—circular-arc portion, 47—hole, 48—slit, 49 a—emboss portion, 49 b—hole, 4T—three-dimensional shape portion,

5—film (portion),

6—boundary portion,

P—intersection (point)

140—stress dispersion patch,

141—horizontally directional patch piece, 142—vertically directional patch piece, 143—circular-arc portion,

150—stress dispersion patch

151—vertically directional patch piece, 152—horizontally directional patch, 152 a—outer peripheral circular-arc portion, 152 b—obliquely inclining portion,

201—pouch body

211—flat film, 212—side surface film 213—side surface seal portion, 215—end seal portion,

202—spout seal portion

203—spout

203 a—lateral (right and left) spout edge portion,

204—stress dispersion patch,

241—circular-arc portion, 242—horizontal straight portion, 243—vertical straight portion,

205—film portion

206—boundary portion

207—outer container,

A—side surface portion, B—end surface portion, C—upper surface portion, D—bottom surface portion,

101, pouch body, 102—spout seal portion, 103—spout, 103 a—spout edge portion, 104—film portion, 105—boundary portion, 106—self-closing preventing member.

Best Mode for Embodying the Invention

Best modes for embodying the invention will be described hereunder with reference to embodiments shown in the drawings.

First Embodiment

FIG. 1 represents a pouch with a spout according to a first embodiment of the present invention.

This pouch with the spout provides a bag body shape formed by laminating flexible films, and includes a pouch body 1 in which film end portions forming a seam are thermally fused and sealed, and a spout 3 which is disposed between the film end portions of the pouch body 1 and is thermally fused together with the film end portions. A stress dispersion patch 4 is further disposed as a stress dispersion piece and bonded to the outer surface of the pouch body 1 so as to partially cover a spout seal portion 2 of the spout 3 and a deformable film portion 5 in the manner such that the stress dispersion patch 4 straddles a boundary portion 6 between the spout seal portion 2 as a thermally fused portion and the deformable film portion 5 facing to an inside space of the pouch body 1.

The pouch body 1 is a gazette bag type in an illustrated example, and as shown in FIG. 1D, is composed of a pair of front and back surface side flat films 11, 11 and vertically doubly folded two lateral side surface films 12, 12.

The doubly folded side surface films 12, 12 are thermally fused, at their front and rear edge portions, to the lateral side edges of the flat surface films 11, 11, respectively, so as to form side edge seal portions 13, 13 as shown in FIGS. 1A and 1B. The side edge portions of the flat surface films 11, 11 have bottom side lower portions providing obliquely inwardly bent portions.

On the other hand, the upper side edges of the side surface films 12, 12 are thermally fused to upper side edges of the flat surface films 11, 11 as shown in FIG. 1A, and the spout 3 is thermally fused to the central portion of the upper side edges of the flat surface films 11, 11 between the lateral (right and left) upper side seal portions 14, 14 so as to provide the spout seal portion 2. This spout seal portion 2 is continuous to the lateral upper side seal portions 14, 14.

Further, the central portions of the lower side edges of the flat surface films 11, 11 are thermally fused so as to form the bottom side seal portion 15.

A film material forming the pouch body 1 is not specifically limited. However, since in a case where the film does not include an aluminum foil layer, edge-cut (cutting at an edge portion) will be easily caused, a film material including no aluminum foil layer is preferred.

The spout 3 is provided with, as shown in FIGS. 1A and 1B, a base portion 31 in form of boat-shape or fusiform-shape and a spout tube portion 32 projecting upward from the base portion 31, and the spout tube portion 32 is closed by a cap 33.

The base portion 31 also includes an extension 36 extending toward lateral sharpened edge portions 3 a, 3 a from a central portion 35 through which the discharge port 34 penetrates so as to be gradually made thin. The film end portion of the spout seal portion 2 has a boat-shape or fusiform-shape like the cross sectional shape of the base portion 31.

The stress dispersion patch 4 is composed, as shown in FIG. 1A, of a small piece made of plastic having a circular-arc shape surrounded by a straight line portion 42 connecting both ends of the circular-arc portions 41, 41. The length of the straight line portion 42 corresponds to substantially full width of the pouch body 1 including the spout seal portion 2 and extending to the ends of the lateral upper side seal portions 14, 14. The circular-arc portion 41 extends by a predetermined dimension toward the film portion 5 over the spout portion 2 and the boundary portion 6 between the upper side seal portion 14 and the deformable film portion 5 so as to largely cover the area near the boundary portion 6 between the spout seal portion 2 and the upper side seal portion 14 including the intersection P of the lateral edge portions 3 a, 3 a of the spout 3 and the boundary portion 6 as the inner edge portion of the spout seal portion 2. Of course, any other structure may be adopted as far as the stress can be dispersed, and for example, as shown in FIG. 1D, a through hole 44 may be formed to a portion corresponding to the intersection P of the edge portion 3 a and the boundary portion 6.

Further, the stress dispersion patch 4 is provided, as shown in FIG. 1C, with a three-dimensional shape similar to the shape of the spout 3, and in the illustrated embodiment, is provided with a three-dimensional shape portion 4T of semi-fujiform-shape or semi-boat-shape similar to the sectional shape of the base portion 31, and the three-dimensional shape portion 4T is closely contacted to the spout seal portion 2.

The stress dispersion patch 4 is bonded by means of bonding agent or pressure sensitive adhesive. The stress dispersion patch 4 may be bonded by means of double coated tape, or may be thermally fused. That is, in other words, it is necessary to be tightly bonded to the surface of the pouch body 1 so as not to be peeled off.

In the illustrated embodiment, the outer peripheral shape of the stress dispersion patch 4 is composed of one circular-arc portion 41 and one straight line portion 42 so as to provide a circular-arc surface shape, but it may be only required that the outer peripheral shape of the portion to be bonded to the film portion side provides a smooth curve line. For example, as shown in FIG. 1E, there may be adopted a shape in which the circular-arc portion 41 and the straight line portion 42 are connected through the lateral straight line portions 43, 43, or as shown in FIG. 1F, a film portion side straight line portion 45 parallel with the straight line portion may be formed in place of the circular-arc portion 43, and a rectangular shape having round corner portions may be adopted in which the corner portions of the lateral straight line portions 43, 43 and the film portion side straight line portion 45 are rounded so as to provide a circular-arc portion 46. Various other shapes may be further adopted.

As a material for the stress dispersion patch 4, there may be adopted, for example, various plastic materials such as polypropylene, polyethylene or like, or a laminated structure composed of a plurality of laminated materials may be utilized. That is, the material for the stress dispersion patch 4 is not limited to the plastic material and many other materials may be adopted as far as it has rigidity capable of dispersing the stress, such as paper, rubber, metal, wood, cloth, etc. Further, by using a resin material or substance similar to that forming the pouch body 1 or spout 3, the necessity for separating the materials at the time of disposal can be eliminated, thus being advantageous for disposal.

It is desired for the stress dispersion patch 4 to have a thickness capable of providing a proper rigidity, and the thickness is determined in consideration of the substance, size and the like. In a case of having an exceeding thickness, the rigidity will increase much, which may result in that a stress is concentrated on an outer peripheral circle of the stress dispersion patch and the film side bonding portion, and on the contrary, in a case of less thickness, the stress dispersion effect will be reduced. In various considerations, it is preferred and proper for the stress dispersion patch to have a thickness of about 0.5 mm in a case where the capacity of the pouch is about 100 ml and the substance of the pouch is plastic. In addition, by forming a plurality of holes 47, as rigidity adjusting means, to the stress dispersion patch 4 as shown in FIG. 2A, the flexibility of the stress dispersion patch 4 can be controlled, in addition to a sliding-stopping effect at a gripping time.

According to the pouch with the spout of the embodiment mentioned above, even if the pouch body 1 is swelled by a thermal expansion of an inner content or an increasing of an inner pressure of the pouch body 1 by an impact at a time of falling, the film portion around the intersection P of the lateral edge portions 3 a, 3 a of the spout 3 of the pouch body 1 and the boundary portion 6 between the spout seal portion 2 and the film portion 5 is prevented from being deformed by the provision of the stress dispersion patch 4, so that the stress in not concentrated on the intersection P of the boundary portion 6 and the lateral edge portions 3 a, 3 a, and hence, edge-cut around the crossing point P from the boundary portion 6 can be prevented.

Further, since the outer peripheral shape of the extending portion to the film portion 5 of the stress dispersion patch 4 is formed as the circular-arc portion 41 so as to provide a curved portion having no edge portion, there is no fear of the concentration of the stress on the outer periphery of the stress dispersion patch 4.

The rigidity may be reduced by providing a number of slits 48 as shown in FIG. 2B or, as shown in FIG. 2C, by gradually reducing the thickness “t” toward the outer periphery so that the stress does not concentrate on the circular-arc portion 41 of the outer peripheral edge of the film portion side bonded portion of the stress dispersion parch 4.

Furthermore, since a proper rigidity is caused by providing the stress dispersion patch 4, even if the inner content is discharged and the inner pressure is hence reduced, the film portion 5 is held by the stress dispersion patch 4, and the self-closing of the pouch body 1 at the spout root portion will be prevented. Accordingly, the self-closing preventing member used in the conventional art is not needed.

Still furthermore, since the stress dispersion patch 4 has a proper rigidity, this stress dispersion patch 4 may be utilized as a hand grasping portion and the portion to be capable of being grasped may be widened. By forming the surface of the stress dispersion patch to be irregular through, for example, emboss working, the stress dispersion patch 4 serves as slip-preventing portion, which further enhances the grasping function.

Since the stress dispersion patch 4 is attached to the outer surface of the pouch body 1, it is applicable to an existing pouch with a spout, and in addition, the selection of the substance of the stress dispersion patch 4 does not influence the inner content.

In addition, it is possible to differentiate the stress dispersion patches by changing shapes, applying colors and applying decorations to the stress dispersion patches 4.

FIGS. 2D and 2E represent modified examples of the stress dispersion patches.

Although in the described embodiment, the stress dispersion patch 4 is applied so as to widely cover the whole of the boundary portion, as well as the spout seal portion, between the lateral upper side seal portions 14, 14 and the film portion 5, the stress spout patch 4 may be applied so as to cover only the vicinity of the intersection P of the lateral edge portions 3 a, 3 a of the spout 3 and the boundary portion 6 as shown in FIG. 2D.

In this modification, the stress dispersion patch 140 has approximately T-shape and includes a horizontal patch piece 141 extending toward end portions of the lateral upper side seal portions 14, 14 from the spout seal portion 2 and vertical patch piece 142 at the central portion of the width corresponding to the spout seal portion. The vertical patch piece 142 extends toward the film portion 5 deformable by a predetermined dimension over the boundary portion 6 of the spout seal portion 2. The lower side portion of the horizontal patch piece 141 extends along the lower side portions of the spout seal portion 2 and the lateral upper side seal portions 14, and on the other hand, the lateral side edges of the vertical patch piece 142 provides a recess-shaped circular-arc shape. The circular-arc portion 143 has almost ¼ circular-arc shape, and one end thereof is positioned at a corner portion of the vertical patch piece 142 and the other end thereof forms a smooth curved shape connecting to the lower side edge of the horizontal patch piece 141. Further, it may be preferred that the corner portion of the vertical patch piece 142 is formed to be round.

The periphery of the intersection P of the lateral edge portions 3 a, 3 a of the spout 3 and the boundary portion 6 is covered by the circular-arc portion 143.

According to the structure mentioned above, when the inner pressure is increased and the pouch body 1 is swelled, the deformation of the film portion near the boundary portion of the spout seal portion 2 is suppressed by the vertical projection 142 of the stress dispersion patch 4, and the stress is dispersed along the circular-arc portion 143, so that the edge of the film can be prevented from being cut (i.e., edge-cut).

FIG. 2E shows an inverted T-shape of a stress dispersion patch 150, which is composed of a vertical patch piece 151 extending vertically and a horizontal patch piece 152 extending laterally from the lower end portion of the vertical patch piece 151. The vertical patch piece 151 has a width substantially the same as that of the spout and extends toward the film portion (5) side by a predetermined amount from the boundary portion 6 of the spout seal portion 2. The horizontal patch piece 152 includes an outer peripheral circular-arc portion 152 a and an oblique portion 152 b obliquely extending from the lateral both ends of the outer peripheral circular-arc portion 152 a toward the lateral side edges of the vertical patch piece 151. The lateral both end portions of the horizontal patch piece 152 are positioned on the outer side of the lateral edge portions 3 a, 3 a of the spout 3 with respect to the center line of the spout 3, and the intersection P of the lateral edge portions 3 a, 3 a of the spout 3 and the boundary portion 6 is surrounded three-directionally by the horizontal patch piece 152, the vertical patch piece 151 and the upper side seal portion.

According to such arrangement, even if the pouch body 1 is swelled by the increasing of the inner pressure, the deformation of the film portion 5 near the boundary portion of the spout seal portion 2 can be suppressed by the vertical patch piece 151 and the horizontal patch piece 152 of the stress dispersion patch 150, so that the edge of the film portion can be prevented from being cut.

Second Embodiment

FIG. 3 represents a pouch with a spout according to the second embodiment of the present invention.

This pouch with the spout is accommodated in a package container having a high rigidity and is fixed to the package container 207 by means of a spout 203. In this structure, the pouch has a reduced capacity in a state contained in the package container 207.

The pouch with the spout has a bag body formed by laminating flexible films, and the bag body is provided with a pouch body 201 formed by thermally fusing and then sealing end portions of the film forming a connected seam portion and a spout 203 which is inserted between the end portions of the film of the pouch body 201 and thermally fused and sealed with the film end portions.

The pouch body 201 is formed by bending a flat film material into a pair of front and back flat surface film portions 211, 211 and a pair of side surface film portions 212, 212 folded between both side edge portions of the flat surface film portions, and both the end portions of the bent film are sealed by a side seal portion 213 so as to provide a cylindrical shape. The pouch body is composed of a gazette bag by sealing both the end portions with a pair of end seal portions 215, 215 with the side surface film portions 212, 212 being folded, and it is used by a state opened in a rectangular shape.

That is, in the state opened in the rectangular parallelelepiped shape, the spout 203 is directed upward, and the opened structure provides a hexagonal surface shape composed of a pair of front and back side surface portions A, A, lateral pair of end surface portions B, B, an upper surface portion C and a bottom surface portion D, in which the side surface portions A, A and the end surface portions B, B are formed by bending the flat surface film portions 211, 211 constituting the pouch body 201, and the upper surface portion C and the bottom surface portion D are formed by the side surface film portions 212, 212. The end seal portion 215 extends vertically at the central portion of the end surface portions B, B. The side seal portion 213 extends to the lateral both end portions along the upper edge of the one of the side surface portions A, A, then turns round the upper edge portion of the end surface portions B, B and extends toward the end seal portion 215 positioned centrally of the upper edge portion of the end surface portions B, B.

When it is required to reduce the inner capacity of the pouch bag body, the end surface portions B, B, the upper surface portion C and the bottom surface portion D are folded inward so that the distance between the side surface portions A, A is narrowed in a parallel state.

The side seal portion 213 is formed along one corner ridge line of the flat surface film portion 211, 211 and the side surface film portions 212, 212, and the spout 203 is thermally fused to this side seal portion 213 to thereby form the spout seal portion 202. That is, the spout 203 is inserted between the film end portions of the flat surface film portion 211 and the side surface film portion 212 positioned on the side of one of the end surface portions B of the upper side edge of the side surface portion A, and then thermally fused together with the film, thus forming the spout seal portion 202. The spout seal portion 202 is continued to the side seal portion 213.

The thermally fused spout 203 has a base portion 231, which has, as shown in FIG. 3C, a boat-like shape or fusiform shape in section, and a spout tube 232 is projected upward over the base portion 231. The spout seal portion 202 has also a boat shape or fusiform shape as like as the cross sectional shape of the base portion 231 of the spout 203.

The stress dispersion patch 204 is bonded to the outer surface of the side surface portion A to which the spout 203 is mounted. The stress dispersion patch 204 is bonded in a manner such that it straddles the boundary portion 206 between the spout seal portion 202 and the deformable film portion 205 facing the surface of the inner space of the pouch body 201 so as to partially cover both the spout seal portion 202 and the deformable film portion 205.

This second embodiment differs from the first embodiment in the point that, in the first embodiment, the stress dispersion patch 4 is bonded to both the front and back surfaces of the pouch body 1, but in the second embodiment, since the upper surface portion C is opened at the right angle with respect to the spout seal portion 202 in a usual using state, the stress dispersion patch 204 is bonded only to the side surface portion A.

Furthermore, since the spout 203 is mounted on one end side of the side seal portion 213, the stress dispersion patch 204 provides a sector shape, in a plan view, surrounded by the quarter circular-arc portion 241, a horizontally extending straight portion 242 and a vertically extending straight line portion 243. The horizontally extending straight line portion 242 is bonded to the spout seal portion 202 and the side seal portion 213, and the circular-arc portion side portion is bonded to the deformable film portion 205. In addition, the vertically extending straight line portion 243 is disposed along the side edge of the side surface portion A.

With this stress dispersion patch 204, even if the pouch body 201 is swelled by the thermal expansion of the inner content or the increasing of the inner pressure of the pouch body 201 by the impact at the time of falling of the pouch, the film portion 205 around the intersection P of the lateral edge portions 203 a, 203 a of the spout 203 and the boundary portion 206 between the spout seal portion 202 and the film portion 205 can be suppressed from being deformed or broken by the provision of the stress dispersion patch 204, and the concentration of the stress on the intersection. P between the lateral edge portions 203 a, 203 a and the boundary portion 206 can be prevented, so that the edge of the pouch body 201 can be prevented from being cut.

In addition, since the outer peripheral shape of the bonded portion on the film portion side of the stress dispersion patch 204 is formed in the circular-arc shape with no corner portion, the stress is never concentrated on the outer peripheral portion of the stress dispersion patch 204.

Further, with this stress dispersion patch 204, as shown in FIGS. 2B and 2C, in order that the stress is not concentrated on the circular-arc portion 241 bonded to the film portion 205, a slit may be formed or the thickness is made gradually thin toward the outer peripheral side so as to reduce the rigidity.

Furthermore, since a proper rigidity is added by the bonding of the stress dispersion patch 204, when the pouch body 201 is folded, the side surface portions A are supported, and self-closing of the pouch body 201 at the spout root portion can be prevented from causing. Accordingly, a conventionally used self-closing preventing means can be eliminated.

In addition, the stress dispersion patch 204 is bonded to the outer surface of the pouch body 201, so that the inner content is not influenced by the substance of the stress dispersion patch 204. Furthermore, by changing the shapes, colors, decollation or the like of the stress dispersion patch 204, it becomes possible to differentiate products of the pouches.

In this second embodiment, modifications of the stress dispersion patch may be made as in the first embodiment.

Further, in the described embodiments, although the gazette bag type was explained as the pouch body, the present invention is not limited to such gazette bag type, and many other modifications, such as flat surface type or standing pouch type, may be adopted. 

1. A pouch with a spout including a pouch body formed by overlapping and thermally fusing both end portions, forming a seam, of a flexible film material and a spout to be inserted between the film end portions and then thermally fused together with the film end portions to the pouch body, wherein a stress dispersion patch is bonded so as to cover partially both the thermally fused portion of the spout and a deformable film portion in a manner of straddling a boundary portion between the thermally fused portion of the spout and the deformable film portion facing an accommodation space of the pouch body.
 2. The pouch with a spout according to claim 1, wherein the stress dispersion patch is provided so as to cover an intersection of lateral edge portions of the spout and the boundary portion between the thermally fused portion of the spout and the film portion.
 3. The pouch with a spout according to claim 1, wherein the stress dispersion patch has a three-dimensional structure following a shape of the spout.
 4. The pouch with a spout according to claim 1, wherein an outer peripheral shape of a portion bonded to the deformable film portion side of the stress dispersion patch has a smooth curved shape.
 5. The pouch with a spout according to claim 1, wherein slip prevention means is provided on a surface of the stress dispersion patch.
 6. The pouch with a spout according to claim 1, wherein rigidity adjusting means is provided on the stress dispersion patch.
 7. The pouch with a spout according to claim 6, wherein rigidity of the portion to be bonded to the deformable film portion side of the stress dispersion patch is made to be gradually smaller toward the outer peripheral edge thereof.
 8. The pouch with a spout according to claim 7, wherein a plurality of slits are formed to an outer peripheral edge portion of a portion to be bonded to the film portion side of the stress dispersion patch.
 9. The pouch with a spout according to claim 7, wherein a portion to be bonded to the film portion side of the stress dispersion patch has a thickness gradually reducing toward an outer peripheral edge portion thereof.
 10. The pouch with a spout according to claim 2, wherein the stress dispersion patch has a three-dimensional structure following a shape of the spout.
 11. The pouch with a spout according to claim 2, wherein an outer peripheral shape of a portion bonded to the deformable film portion side of the stress dispersion patch has a smooth curved shape.
 12. The pouch with a spout according to claim 3, wherein an outer peripheral shape of a portion bonded to the deformable film portion side of the stress dispersion patch has a smooth curved shape.
 13. The pouch with a spout according to claim 2, wherein slip prevention means is provided on a surface of the stress dispersion patch.
 14. The pouch with a spout according to claim 3, wherein slip prevention means is provided on a surface of the stress dispersion patch.
 15. The pouch with a spout according to claim 4, wherein slip prevention means is provided on a surface of the stress dispersion patch.
 16. The pouch with a spout according to claim 2, wherein rigidity adjusting means is provided on the stress dispersion patch.
 17. The pouch with a spout according to claim 3, wherein rigidity adjusting means is provided on the stress dispersion patch.
 18. The pouch with a spout according to claim 4, wherein rigidity adjusting means is provided on the stress dispersion patch.
 19. The pouch with a spout according to claim 5, wherein rigidity adjusting means is provided on the stress dispersion patch. 